How to Write a Sample letter

This is the letter to convey my apology to the bank customer for the inconvenience of not providing the loan. First of all I should regret for my behaviour and I regret for it in a very precise manner. We could not able to provide the loan amount that you have applied at this time. Since this branch doesn’t have that much worth to finance your amount we could not fulfil your needs. It’s not that easy for me to digest the mistake I have done and am surely a simple sorry will never be equal for my mistake. But as a human I don’t have any other thing to seek for your apologise. Though my actions are mistake I request you to apologise me once and provide me the job again to prove myself.